*{
    margin: 0;
    padding: 0;
}
body{
    width: 100%;
    min-width: 320px;
    max-width: 640px;
    margin: 0 auto;
    font-size: 14px;
    font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, Oxygen, Ubuntu, Cantarell, 'Open Sans', 'Helvetica Neue', sans-serif;
    line-height: 1.5;
    color: #666;
    /* background-color: gray; */
    height: 4000px;
}

/* 顶部 */
.app{
    height: 45px;
    background-color: blue; 
}

.app ul li{
    float: left;
    height: 45px;
    line-height: 45px;
    background-color: #333333;
    text-align: center;
    color: #fff;
    letter-spacing: 0.5px;
    
}

ul{
    list-style: none;
    margin: 0;
    padding: 0;
}
li{
    list-style: none;
}
.app li:nth-child(1){
    width: 8%;
}
.app li:nth-child(1) img{
    width:60%; 
    vertical-align: middle;
}

.app li:nth-child(2){
    width: 13%;
}
.app li:nth-child(2) img{
    width: 30px;
    vertical-align: middle;
}

.app li:nth-child(3){
    width: 54%;
}
.app li:nth-child(4){
    width: 25%;
    background-color: #F63515;
}

/* 搜索 */


.search-wrap{
    /* position: relative; */
    position: fixed;
    height: 44px;
    overflow: hidden; /* 注意！！ */
    min-width: 320px;
    max-width: 640px;
    width: 100%;
    z-index: 100;
}

.search-btn{
    position: absolute;
    /* background-color: pink; */
    top: 0;
    left: 0;
    width: 40px;
    height: 44px;
}
.search-btn::before{
    content: "";
    display: block;
    width: 20px;
    height: 18px;
    background: url(../img/tab.png) no-repeat;
    background-size: 20px 18px;
    margin: 14px 0 0 15px;
    /* border: 1px solid rebeccapurple; */
}

.search-login{
    position: absolute;
    /* background-color: red; */
    top: 0;
    right: 0;
    width: 40px;
    height: 44px;
    color: #fff;
    line-height: 44px;
    font-size: 15px;

}

.search{
    position: relative;
    height: 30px;
    top: 5px;
    background-color: #fff;
    margin: 0 50px;
    border-radius: 15px;
    margin-top: 7px;
}

.jd-icon{
    position: absolute;
    width: 20px;
    height: 15px;
    top: 8px;
    left: 10px;
    /* background-color: pink; */
    background: url(../img/jd.png) no-repeat;
    background-size: 20px 15px;
}

.jd-icon::after{
    position: absolute;
    top: 0;
    right: -8px;
    content: "";
    display: block;
    width: 1px;
    height: 15px;
    background-color: #ccc;
}

.sousuo-logo{
    position: absolute;
    top: 4px;
    left: 45px;
    background: url(../img/search.png) no-repeat;
    background-size: 23px 23px;
    width: 23px;
    height: 23px;
    /* border: 1px solid red; */
    
}

.input{
    position: absolute;
    right: 70px;
    top: 8px;
    border: none;
    outline: none;
    
}


.main-content{
    position: relative;
    height: 200px;
    background-image: linear-gradient(to bottom,rgb(243, 49, 31) ,rgb(226, 44, 28),rgb(192, 38, 17) ,rgb(221, 59, 37));
    border-radius: 200% / 40%;
    /* z-index: 3; */
    
}
.slider{
    z-index: 100;
}
.slider img{
    
    width: 100%;
    z-index: 2;
    /* border-radius: 10px; */
    
}

.tab-banner{
    position: absolute;
    top: 78%;
    color: #fff;
    z-index: 2;
}
.tab-banner img{
    width:100% ;
}

.ul{
    position: absolute;
    top: 200px;
    /* background-color: gray; */
    height: 400px;
    width: 100%;
    z-index: 1;
}
.app-logo{
    position: absolute;
    left: 20px;
    top: 10px;
    /* background-color: pink; */
    width: 100%;
    height: 160px;
}

.app-logo li{
    position: relative;
    float: left;
    width: 70px;
    height: 70px;
    /* border: 1px solid red; */
    /* background-color:  white; */
    /* z-index: 5; */
}

.app-logo li img{
    position: absolute;
    top: 5px;
    left: 10px;
    width:65%;
}

.app-logo .text{
    position: absolute;
    font-size: .6rem;
    color: #666;
    bottom: 5px;
    left: 10px;
}